I HAVE searched and cannot find a better filter than Filtrete. Not only does it make a noticeable difference in the air quality of our home, it has literally saved our HVAC unit. As do most new construction homes, ours came with the standard 'builder grade' system. Coincidentally, we have had a lot of storms and power surges this past summer. When our system (along with seven others in our neighborhood) burnt out last month, we were miraculously able to replace only the compressor, as opposed to the whole system. Since it came at a bad time for us financially, we had to opt for replacing the compressor only. Our HVAC technician told us that had we not been using good filters and replacing them regularly, that would not have been an option. Even though we will eventually have to replace the whole unit, we now have some wiggle room and time to save up. Meanwhile, our 'builder grade' unit and Filtrete filters are functioning beautifully. Thank you, 3M!!! You saved our lives (quite possibly literally--from this Southern heat and humidity)and allowed us some time to research and save for a new HVAC unit down the road a bit.

[This review was collected as part of a promotion.] I love everything about this filter. It does an amazing job, it's easy to install, it comes in the hard-to-find size that I need, and the optional email reminders that it's time to change the filter make life easy and healthy.

After changing my regular pleated air filters with these, I essentially was able to come off of allergy medicine daily. I used to get allergy shots. Now I very rarely get an allergy flare up. I highly recommend allergy sufferers get this filter. I hesitated beforehand too but thought what do I have to lose.

Bought 1 4" airfilter that ended up being 5". Thought it was a fluke and took it back to the store. Went to another store and the only brand availabel was 3m again. Bought a 4" filter and once again measuring in at over 4.5" and does not fit. Last time I buy from 3m. Btw our furnace can fit 2, 2" filters perfectly but not 1, 4".

Excellent air filter. I buy these 20x20x1 sizes and tape them to a regular box fan for a quick, easy, and affordable air filtration unit that I can move around the house wherever/whenever I want. No need for any special high end unit that requires a unique filter that some company stops supporting.

I have a household of 6 and all my children suffer with seasonal allergies. The great thing about this product is as soon as I change my filters my children feel relief within the day until the next time for change from their allergies. Also like clock work, when the filter is near time for change my children allergies will act up to remind me I need to change the filter. I have no complaint with this product! ;)

[This review was collected as part of a promotion.] I have been using this filter for many years! We used to buy the cheap filters and had a constant dust problem in our house. Since using this filter there is no longer a problem! The old saying "you get what you pay for" certainly applies here. Well worth the money for a clean healthy home!

We have a shih 'tzu dog and a siamese cat. Although shih 'tzu's don't really shed and have to be groomed, they still have dander. We switched from the basic, inexpensive furnace filter to the Filtrete Allergen Reduction filter when our son started showing symptoms of allergies. We feel better knowing this filter can trap smaller particles that could cause breathing problems, especially while he sleeps. Our dog is all over the house, so we know he could be distributing dander everywhere. But our cat sleeps most of the day, so we don't think he contributes much to poor air quality, except when he uses the litter box. When the Filtrete filter is removed, it's easy to see what it has trapped, because the media is gray, compared to the pure white of a new one. What a great feeling to know those particles are stuck to the Filtrete filter and not inside our family's lungs.

Outside, air quality was 300-1100 (off-the-scale and very hazardous) with smoke hanging in the air like dense fog. Inside, the indoor air quality monitor says the air is very clean (AQI 23). This is with running the furnace fan continuously and changing filters every 3-4 weeks. The only downside is the smart filter feature doesn't actually know when the filters are dirty, only how much air volume has gone through them.

I am happy with the performance of this filter. However although it slides into the box easily, it is hard to remove. It would be nice to have cutouts in the cardboard for finger holds. It is also hard to remove; it is almost as if it expands. I am afraid I will damage the wires in my furnace as I remove it. It comes out in a few pieces.